It looks like a Blue Gill to me… the colors vary a lot…looks like a Shellcracker (southern Bluegill)…. They get darker purple along the back as big Bulls like yours…here is a pic
Thanks for your help everyone, I was really curious because it was close to a state record in some areas. The fish ended up at 1lb 3oz and 10 inches in length.
Definitley a green sunfish-pumpkinseed cross. We catch them in deer lake in western wisconsin all the time. It gets the dark green color from the green sunfish and the weird blue stripes on the gill from a pumpkinseed. Nice fish!!!